Tera, Singer of Seasons

Whenever you expend 4, add {g}{u}, {u}{r}, or {r}{g}
(You expend 4 as you spend your fourth total mana
to cast spells during a turn.)

Whenever you expend 8, copy another target spell
or permanent, except the copy isn't legendary.
You may choose new targets for the copy. (A copy
of a permanent spell becomes a token.)